Yeah, Champa seems to think the timestopping ability of Hit's would make no difference against him. Even factoring in Hit's fatigue, he was still able to hurt SSJB Vegeta badly when he was suppressed to a level where base Goku could take him once he had knowledge, so it appears Champa still outclasses him by a large amount to think that it would make no difference, despite his time stopping skill growing after the fight.
Even though this contradicts several statements about SSJB being on the level of the gods, from Super it's only to be expected.